body,html{margin:0;padding:0;font-family:sans-serif}.bg-video{position:fixed;top:0;left:0;width:100%;height:100%;object-fit:cover;z-index:-1}header{text-align:center;padding:2rem;background:#00000080;color:#fff}nav a{margin:0 1rem;color:#fff;text-decoration:none}main{padding:2rem}canvas{max-width:800px;margin:2rem auto;display:block}img{max-width:200px;display:block;margin:1rem auto}form{max-width:400px;margin:auto;display:flex;flex-direction:column;gap:1rem}button{padding:.5rem}